Three-Layer Plastic Shipping Bag with Compressible Intermediate Cushioning
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Solution Overview
Problem
Conventional plastic shipping bags are prone to damage and contamination, and existing solutions like paper-based bags with bubble wrap are complex and voluminous, making them inefficient for protecting contents during online trade shipments.
Innovation Solution
A three-layer plastic bag design featuring an inner and outer plastic film layer with a plastic film intermediate layer, where the intermediate layer has gathered or folded strip-shaped areas spaced apart by seams, providing effective cushioning without increasing the package volume, and allowing for easy recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If single-layer plastic bags are used, then the production is simple, but the protection against shocks is insufficient and the bags can be easily perforated
Solution Approach 1:
The patent applies composite materials by combining three different layers: an inner layer (20) made of plastic film, an intermediate layer (30) made of compressible material, and an outer layer (40) made of plastic film. This composite structure provides both shock protection and resistance to perforation while maintaining production feasibility through a layer-by-layer manufacturing process.
2Reliability
If paper bags with inner layer of bubble wrap are used, then the protection against shocks is improved, but the envelopes become very thick and production is complex
Solution Approach 1:
The patent uses thin plastic film layers (inner layer 20 and outer layer 40) combined with a compressible intermediate layer (30) to provide shock protection without the excessive thickness of traditional bubble wrap. The plastic films serve as flexible shells that contain the compressible material, achieving protection with reduced overall envelope thickness.
Solution Approach 2:
The patent changes the physical parameters of the packaging by using a compressible material with specific density and elasticity characteristics in the intermediate layer (30). This allows the material to provide cushioning effect when compressed during shipping while maintaining a compact form factor that reduces envelope thickness compared to rigid bubble wrap structures.
3Reliability
If air chambers extend over the entire length of the mailer, then the protection against shocks is improved, but the packaging volume increases
Solution Approach 1:
The patent segments the protective function into three distinct layers: inner plastic film layer (20), compressible intermediate layer (30), and outer plastic film layer (40). This segmentation allows each layer to contribute specifically to shock protection through different mechanisms (containment, cushioning, and protection), achieving effective protection without requiring large air chambers that would increase packaging volume.
4Reliability
If multiple layers are welded together all the way around, then the protection against contamination is improved, but the production complexity increases
Solution Approach 1:
The patent combines different materials (plastic film layers 20, 40 and compressible material layer 30) into a composite structure where each material provides specific functions. The plastic film layers provide contamination barriers while the compressible material provides shock protection, achieving both protection goals through material selection rather than complex welding patterns.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively protects contents from damage and moisture while maintaining a compact packaging volume, enabling the bags to be used on conventional letter sorting systems without causing operational issues.
Implementation Method 1
the at least one second layer by means of welded and/or glued seams running transversely to the gathered or folded strip-shaped elongated regions
Implementation Method 2
the at least one second layer is spaced apart from each other by a plurality of distances and has gathered or folded strip-shaped elongated areas
Data Source
Figure 1
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AI summary
The present invention relates to a plastic bag or pouch comprising a front wall, a back wall, an opening and a bottom, and optionally opposing side walls, wherein the front wall and/or the back wall are at least three-layered, wherein the at least three-layered front wall and/or the at least three-layered back wall comprise a first layer (inner layer), at least a second layer (intermediate layer) and a third layer (outer layer), wherein the first layer is related to the second layer to the bag or pouch.The invention relates to the use of the plastic bags or pouches according to the invention as shipping bags or pouches, in particular for transporting goods in online retail. The second layer is arranged between the first and third layers and comprises or consists of a plastic film. The third layer faces the outside of the bag or pouch with respect to the second layer and/or forms the outside. The second layer has a plurality of spaced-apart gathered or folded strip-shaped elongated areas. The second layer is connected to the first and/or third layer by means of welded and/or adhesive seams that extend transversely, in particular substantially orthogonally, to the gathered or folded strip-shaped elongated areas. Furthermore, the invention relates to the use of the plastic bags or pouches according to the invention as shipping bags or pouches, in particular for transporting goods in online retail.